I got a NexiGo portable gaming monitor that I’m pretty happy with. It is a 16 inch 2560x1600 display, 144Hz, and supports FreeSync. I got a bidirectional DisplayPort to USB C cable so that I could use it with my desktop for LAN parties and it’s great. It has a built in flip-out kickstand, a folding magnetic cover, OK built in speakers (good enough to game with anyways), and can be powered via a second USB C port with an A to C cable. On a device that supports USB C video output like a laptop or Steam Deck it can run off a single cable but I mostly wanted it for my desktop.
Leave it on, but turn off the monitor. I have it set up as a GitLab runner for some projects and also want to be able to SSH/SFTP in to access files, run updates, etc.